Parity-Nonconserving One-Pion-Exchange Potential

It is argued that the strangeness-conserving weak currents can contribute to the single-pion-exchange parity-nonconserving potential between nucleons bound in nuclei. Although this contribution is reduced by $\frac{V_{\mathrm{nuclear}}}{M}\sim 0.04$, it may be comparable in strength with that usually calculated. Estimates of the strength of an off-mass-shell $\mathrm{NN}\pi$ vertex are carried out; neutral pion emission can occur. It is shown that the $\Delta \mathrm{}\left(1236\right)N\pi$ weak vertex can be neglected.